[OSX] Shockshell bash patch

osx_shockshell_patch.sh

#!/bin/bash
if [ ! $(command -v brew) ]; then
  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
fi
if [ ! -f /bin/bash.bak ]; then
  brew update
  brew install bash
  brew upgrade bash
  sudo mv /bin/bash /bin/bash.bak
  sudo rm /bin/bash
  sudo ln -s /usr/local/bin/bash /bin/bash
else
  echo "The patch has already been applied (aka you already have a /bin/bash.bak file)"
fi